delegate methods: restore ellipsis type (IDEA-171529)

java/java-tests/testData/codeInsight/delegateMethods/afterPreserveEllipsisType.java

@@ -0,0 +1,11 @@
+class Foo {
+    void foo(String... s) {}
+}
+
+class Bar {
+    Foo myDelegate;
+
+    public void foo(String... s) {
+        myDelegate.foo(s);
+    }
+}

java/java-tests/testData/codeInsight/delegateMethods/beforePreserveEllipsisType.java

@@ -0,0 +1,8 @@
+class Foo {
+    void foo(String... s) {}
+}
+
+class Bar {
+    Foo myDelegate;
+    <caret>
+}